What is the income requirement for a Thai marriage extension of stay, and do I need to provide pre-tax or post-tax income?

Incomeletter to prove annual income for extension of stay based on marriage.

My embassy, Swedish, still write incomeletter.

The income required is 400 000 bath in bank or monthly income 40 000 bath.

Based on the Tax Assessment from the Tax Agency, is that the Assessed employment income before taxes, or after?

I could not find a statement from Thai immigration saying if it's before or after taxes.

If I remember correctly, the Tax Assessment is valid for an income letter.

Sorry if I asked a question already answered, I could not find the search function on this pad